Electropneumatic brake device.



W. V. TURNER. ELEGTROPNEUMATIG BRAKE DEVIGE.

APPLICATION FILED NOV. l0, 1910` WITNESSES THE MORRIS PETERS CO.. PHOTo-LITHO.. WASHINGIUN, D. y.

`UNITED STATES PATENT GFFICE.

WALTER V. TURNER, OF EDGEWOOD, PENNSYLVANIA, .ASSGNQR TO WESTINGHOUSE AIR BRA-KE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A GORPORATION QF BENNSYLVANIA;

ELEGTROPNEUMATIC. BRAKE DEVICE;

Specicaton of Letters Patent.

Paten-ted Mar. 16, 1915..

Application led November 10,1910.l Serial No'. 591,724;

T all whom it may-concern Be it known that I', WALTER V. TURNER, a citizen of the United States, residing at Edgewood, inthe county of Allegheny and State of Pennsylvania,have invented new and useful Improvements in Electropneumatic Brake Devices, of which the following isa specification.

r1`his invention relates to electro-pneumatic brakes-for traction and other cars in which pneumatic brakes may be either controlled by variations in train pipe pressure or electrically.

With brake systems of the above character it has been proposed to employ ay normally energized electrically controlled device adapted when denergized to effect an application of'thebrakes, sothat' upon failure of current the brakes willk be` automatically applied; It is desirable to provide some form of'cut-out` switch for the electric brake circuits, sol that the circuits may be opened' in case of necessity as where something goes wrongwith the circuits or where al car is` returned to the barns or is temporarily taken out. of" service. In opening the circuits, the circuit of the above mentioned electrically controlled device is also opened andA this causes arr` application at a time when it isfnot desired..

The principal object of` my `invention is to obviate theaabove diiiiculty,.and for this purp'osel provide means operated upon movement-'of the cut-out switch to o or cut-out positionA for preventingthe electrically controlled4 device from: causing an application of the brakes.

In the accompanying drawing; Figure 1 isia diagrammatic view of an electro-pneumatic brake equipment for acar, with my improvement applied thereto; Fig.l 2 a sectional view of` a` cut-out or master brake switch embodying my invention; Fig. 3 a diagramr showing the different positions of the master brake-switch handle; and Fig. 4 a. plan view ofthe rotary valve employedv in connection with the master brake switch.

The electro-pneumatic brake equipment may be of' any desired type, such as that shown in Fig. 1 of the drawings, comprising a triple valve device l, train pipe 2, brake cylinder 3, auxiliary reservoir 4, electric application and release magnets 5 and 6- respectively, and a combined brake valve and brake switch 7.

According to my invention, a cut-out or master brake switch 8 is provided having a drum 94 carrying contact segments for engagement with stationary contact fingers forthe purpose of controlling-the brake circuitsleadingto the controlling brake switch Oneendof the drum 9 is provided with an operating handle 12 and the opposite end has akey extension 13 adapted to engage in a socket in a rotary valve 14. The valve 14 is provided with cavities in its face havingA through ports 11 therefrom and in all positionsof the handle 12 except otiposition said cavities are adapted to register with ports 21 in the rotary valve seat. The ports2l open into a passage-15, leading to valve 16 which is controlled by magnet 23 for releasing air from passage 15 to exhaust port 44. When ports 2l register with cavities 10, communication is opened from passage to pipe 17 which leads to a chamber 18 on one side of a movable abutment 19. A vent valve 2O is adapted to be operated by the abutment 19 for controlling communication from train pipe 2` to an eX- haust port 22. One terminal of the novoltage magnet 23 is connected by a wire 24 to. contact iinger 25 in the master brake switch 8 and the other terminal is grounded through wire 26.

The application' and release magnets 5 and 6 may have one terminal connected to ground andthe other respective terminals to line wires 27 and 28.

An emergency circuit may also be provided for electrically eiiecting. an emergency application of the brakes, such as supply wire' 29 and` emergency train wire 30 and any desiredl emergency device may be bridged across said wires which is adapted to effect an emergency application upon energization.

Wires36, 37, and 38' connect contact fingers 39, 40, and 41 of the controlling brake switch with respective contact fingers 33, 34, and of the master brake switch, a source of current is connected to contact linger `32, andv wire 24` from the no-voltage magnet 23 is connected to contact iinger 25 of the master brake switch.

The master brake switch has four positions; in position 4, all the circuits are made and this is the normal running position; in position 3, the supply wire 29 is disconnected from the source of current so that the emergency devices are cut out of action; in position 2, all the circuits are opened except the emergency circuit and the no-voltage magnet circuit; and in position 1 all of the circuits are open.

When the master brake switch is thrown to position 1 or the ol'1 position the valve 14 is rotated to a position in which communication is cut off from passage 15 to pipe 17. This also denergizes the magnet 23 and opens valve 16, but the position of valve 14 prevents fluid from being vented from chamber 18, so that the vent valve 20 is not opened to vent air from the train pipe 2. It will thus be seen, that when the master brake switch is in any of its operating positions, the no-voltage magnet is effective upon deenergization to vent air from the abutment 19, but when the switch is opened, communication between the vent valve device and the no-voltage magnet is cut off and the deenergization of the magnet is not effective to operate the vent valve. Thus an application of the brakes is prevented at this time.

i Having now described my invention, what I claim as new and desire to secure by Letters Patent, is

1. The combination with an electro-pneumatic brake apparatus, of a switch device for controlling the electric brake circuits, pneumatically operated means :tor effecting an application of the brakes, and means controlled by said switch device for cutting said pneumatically operated means out of "action in the o position of said switch.

Q. The combination with an electro-pneumatic brake apparatus, of a switch device for controlling the electric brake circuits, a valve device adapted to eli'ect a pneumatic application of the brakes, and means adapted upon movement of said switch device to of position for preventing the operation of said valve device.

3. The combination with an electro-pneumatic brake apparatus, having electric circuits for controlling the brakes and a train pipe, a reduction in pressure in which is adapted to el'ect an application of the brakes, of a switch device for controlling the electric brake circuits, an automatic vent valve device adapted to vent air from the train pipe and means operated by the movement of said switch device forcutting said vent valve device out of action.

4. The combination with an electro-pneumatic brake apparatus having a valve device operated by a reduction in train pipe pressure for effecting an application of the brakes and electric circuits for controlling the brakes, of means for venting air from the train pipe, an electrically operated device normally energized and adapted upon denergization to eect the operation of said means, and a switch device for controlling the electric brake circuits and adapted in one position to prevent the operation of said means. y

5. The combination with an electro-pneum atie brake apparatus having a valve device operated by a reduction in train pipe pressure for effecting an application of the brakes, and electric circuits for controlling the brakes, of means for venting air from the train pipe, an electrically operated device normally energized and adapted upon denergization to effect the operation of said means, and a switch device for controlling the electric brake circuits and adapted upon movement to off position to cut said means out of action'.

6. The combination with a fluid pressure brake, of a no-voltage magnet devicenormally adapted to open a ventV portl independently of the position of the brake valve and eflect a reduction in train pipe pressure upon denergization, a switch for controlling the circuit of said no-voltage magnet, and means associated with lsaid switch and adapted in oil" position to prevent said magnet device from eiecting a reduction in train pipe pressure upon opening said vent port.

7. In an electro-pneumatic brake system, the combination with a pneumatic brake and electric 'circuits for controlling said brake to effect either a service or an emergency application of the brakes, and a controlling switch'for said circuits, of a master switch device adapted in one position Vto connect up both the service and emergency circuits and in another position to open said service circuit and close said emergency circuit.

8. In an electro-pneumatic brake system, the combination with a pneumatic brake and electric circuits for controlling said brake to effect either a service or an emergency application of the brakes, and a controlling switch for said circuits, of a master switch having one position in which all circuits are open, another position in which the service circuit is open, and another position in which all circuits are closed.

9. In an electro-pneumatic brake system, the combination with a pneumatic brake and electric circuits for controllingV said brake to eect either a service or an emergency application of the brakes, and a controlling switchfor said circuits, of a master switch having one position for opening said service and said emergency circuit, another position for closing the service circuit and obening the emergency circuit, another position for closing the emergency circuit and opening the service circuit, and another position for closing said service and said emergency circuits.

10. The combination with a fluid pressure brake having a train pipe and a brake valve, of a no-voltage magnet adapted upon deenergization to effect a reduction in train pipe pressure to apply the brakes, a switch device for controlling the circuit of the novoltage magnet, and a rotary valve operated by the movement of said switch for controlling a communication through Which the magnet operates to effect a reduction in train pipe pressure.

ll. The combination with a Huid pressure brake having a train pipe, of a vent valve device operated by a variation in fluid pressure for eecting a reduction in train pipe pressure, a no-Voltage magnet adapted upon denergization to vary the pressure on said vent valve device, a switch device for controlling the circuit of said no-voltage magnet, and a rotary valve operated by Said switch and adapted in the open position of the switch to cut ofi communication from said no-Voltage magnet to said vent valve device.

In testimony whereof I have hereunto set my hand.

WALTER V. TURNER. Witnesses:

A. M. CLEMENTS, CLYDE V. MCCURDY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. c. 

